DRV8873: Multiple SR pin connected together

Hi Takuchi,

Thank you for your post.

Takuchi said:

I am using 5 different DRV8873H for my application.

Can I connect all 5 SR pin together so that they all have the same setting?

The SR pin is a multi-level analog voltage input pin. The resistors given in the table for a single device takes into account the internal pull-up and pull-down resistors of the device. See below block diagram from the datasheet.

When you connect multiple devices' SR pins together these internal resistors go in parallel and may change the expected voltage on the pin with the external resistors. An approach could be to measure the voltage on SR pin while only one device is connected and choose an external resistor value and connection to achieve the same voltage with all five devices connected together to ensure correct operation of the SR setting with the pins of all 5 devices connected together. Thanks.

Regards, Murugavel